On 31.08.2016 17:14, Trinh Ngoc-Duy wrote:
> Dear Fluka users,
>
> I'm using FLUKA to calculate the production rate of particle by
> interaction of a primary beam with a thick target. I'm using USR Track
> to obtain the spectre of particle produced in the target. I see that
> USR TRACK give results with units of particle /(cm2/GeV/primary beam).
>
> So if I send a beam into a target. The reaction is happen*inside the
> target*, and i score the spectre of produced proton for example. I
> obtain the total flux of proton :
>
> 8 proton /(cm2/GeV/primary beam). with a energy bin of [0:0.1] GeV.
>
> The target is a box with each side of 1 cm. So the area of a face is :
> 1*1=1cm2.
>
> To obtain the total production rate of proton, i multiple 8*0.1*1=0.8
> (proton per primary beam).
>
> I'm not sure about this value because when I simulate a isotropic beam
> *inside* a target, and score the total flux with the same method.
> Normally i should obtain the value of 1 because my target cover all
> the beam. But FLUKA gives me 6.1 (proton/cm2/GeV/primary beam) =
> 6.1*1*0.1=0.61 (proton per primary beam) (with a energy bin of [0:0.1]
> GeV).
>
> I put my input and my results in attachment. Please give me an idea.
>
> Thank you very much.
>
> ND Trinh, GANIL, France.
>
>
>
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Dear ND Trinh,
The track length of each proton produced inside of the thick target is
different! Even in you example with isotropic source, the track length
within the target varies from minimum (half of the edge) to maximum
(half of the diagonal). As it shown in *sum.lis file:
Tot. response (p/cmq/pr) 0.6107748 +/- 2.8535640E-02 %
( --> Track l. (cm/pr) 0.6107748 +/- 2.8535640E-02 % )
Best regards,
Mikhail
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Received on Thu Sep 01 2016 - 13:54:42 CEST